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Related Experiment Videos

Ca-sensitive Na transport in sheep omasum.

G Schultheiss1, H Martens

  • 1Department of Physiology, Faculty of Veterinary Medicine, University of Giessen, D-35392 Giessen, Germany.

The American Journal of Physiology
|June 11, 1999
PubMed
Summary

Sheep omasum exhibits an electrogenic sodium (Na) transport mechanism. Divalent cations like calcium and magnesium inhibit this Na transport, suggesting a distinct pathway.

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Area of Science:

  • Animal Physiology
  • Gastrointestinal Physiology
  • Membrane Transport

Background:

  • The omasum, a key digestive organ in ruminants, plays a crucial role in water and electrolyte absorption.
  • Understanding the specific mechanisms of ion transport in the omasum is essential for comprehending overall ruminant digestive physiology.

Purpose of the Study:

  • To investigate the electrogenic sodium (Na) transport mechanism in the sheep omasum.
  • To characterize the kinetic properties and regulatory factors influencing Na transport.

Main Methods:

  • Short-circuit current (Isc) measurements to assess active ion transport.
  • Na flux measurements to quantify Na movement across the tissue.
  • Transepithelial electrical potential difference recordings and intracellular microelectrode impalements.
  • Pharmacological and ionic manipulations, including removal of divalent cations and addition of specific inhibitors.

Main Results:

  • Sheep omasum tissues demonstrated a serosa-positive short-circuit current (Isc) consistent with active Na transport, exhibiting Michaelis-Menten kinetics.
  • Removal of divalent cations (Ca2+ and Mg2+) significantly enhanced Isc, indicating their inhibitory role.
  • Transepithelial studies revealed the transport of other cations (K+, Cs+, Rb+, Li+) through nonselective cation channels inhibited by divalent cations.
  • Intracellular recordings confirmed changes in electrical properties upon removal of mucosal divalent cations.

Conclusions:

  • The sheep omasum possesses a distinct electrogenic sodium transport mechanism.
  • This transport is modulated by divalent cations, likely through nonselective cation channels.
  • Further research into these channels could elucidate their role in omasal function and overall ruminant health.

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